“We assess Russian President Vladimir Putin ordered an influence campaign in 2016 aimed at the U.S . presidential election. Russia’s goals were to undermine public faith in the U.S. democratic process, denigrate Secretary Clinton, and harm her electability and potential presidency. We further assess Putin and the Russian Government developed a clear preference for President-elect Trump."
Needless to say, this vastly undercuts any of Trump's attempts to rely on the House report that ended its investigation prematurely and didn't interview many witnesses, largely discrediting that House committee report with specifics.
You can read the full Senate assessment here.